Boiler.



PATENTED DEC. 26, 1905. J. E. GRACE.

BOILER.

APPLICATION FILED AUG.27,1904.

4 SHEETS-SHEET 1.

.Fttarrwy PATENTED DEC. 26, 1905. J. E. GRACE.

BOILER.

APPLICATION FILED we. 27, 1904 v 4' SHEETS-SHEET 2.

Witnesses agm fivyM W No. 808,284. BATENTED DEC. 26, 1905.

J. E. GRACE.

BOILER.

APPLICATION FILED we. 27, 1904.

4 SHEETS-SHEET a.

No. 808,284. PATENTED DEG.26,1905.

J. E. GRACE.

BOILER.-

APPLIGATION FILED AUG.2'I,1904.

4 SHEETS-SHEET 4,

if 5' iI'Z- 4 I Q i Q UNITED STATES PATENT OFFICE.

BOILER.

Specification of Letters Patent.

Patented Dec. 26, 1905.

Application filed August 27, 1904. Serial No. 222,444.

To all whom it may concern:

Be it known that I, JOHN EDWARD GRACE, a subject of the King of Great Britain, residing at Ashton-under-Lyne, in the county of Lancaster, England, have invented new and useful Improvements in Boilers for the Generation of Steam or other Purposes, of which the following is a specification.

My invention relates to improvements in the construction of boilers to be used for the generation of steam or for other purposes and where the evaporative capabilities of such boilers are required to be of a high standard of efficiency. The types of boilers, among others, to which this invention is particularly applicable are Lancashire, Cornish, marine, and vertical boilers. By my improvements herein described I seek to increase the effective heating-surface at suitable positions, starting from a point near to the furnaces; to stimulate the water circulation to promote the evaporative powers and effect rapid steam generation by more fully utilizing and absorbing the heat from the furnace-gases to provide easy and ample access to any and every portion of the items forming my improvements, together with all requisite facilities for renewals, repairs, and examination, and to provide for the fitting up of a complete installation of my invention to other types of existing steam boilers or generators. I attain these objects by the means illustrated in the accompanying four sheets of drawings, in which Figure 1 is an elevation, partly in section, Fig. 2 a sectional plan, and Fig. 3 an end view, partly in section, of a Lancashire boiler provided with my improvements. Figs. 4 and 4 are elevations, partly in section, and Figs. 5 and 5 sectional end Views at line A B, of a Cornish boiler provided with my improvements. Figs. 6, 8, and 10 are end views, and Figs. 7, 9, and 11 longitudinal sections, respectively, at an enlarged scale, of various forms of water-pockets constructed in accordance with my invention for Lancashire and Cornish boilers.

Similar letters refer to similar parts throughout the several views.

In carrying out my invention and referring I to the figures generally I employ suspended water-pockets a of suitable size and design to meet the various positions in which they are to be fitted and conditions under which they have to work. These water-pockets a are provided and fitted with either horizontal or inclined fire-tubes b of suitable diameter, including also a sufficiency of stay-tubes, all of which pass through the whole length of the pockets (1 and the water therein contained.

The immediate front ends of these fire-tubes are preferably of an increased external diameter to facilitate renewal. When installed,

the various pockets a (reckoned in receding order from the furnaces) may be fitted with tubes varying in diameter in each pocket or sets of pockets a, as shown in Figs. 4 and 5 so as to permit of increasing the number of such tubes as the gases decrease in temperature, and thereby increase the heating-surface of each pocket successively to suit existing working conditions. Any approved method of securing the tubes in each end plate of pockets (1 maybe adopted, such as expanding and beading, ferruling and calking, or expanding and bell-mouthing. In construction these pockets a may be composed of one or more plates of steel, iron, or other materials flanged and pressedwhen heatedinto requisite shapes andlengths. When a pocket ais formed of more than one plate, the plates are firmly riveted together, welded where necessary, and an ample flange 0 also provided for se curely riveting the finished pocket a in its working position. Iffound practicable, these pockets might be pressed and formed from the flue or furnace ring d, and where a very fierce furnace heat would render such a course necessary then the first suspended pocket from the furnace or fire-grate may be con-' structed either entirely without the firetubes 1;, or if such tubes were introduced they would be of a somewhat increased diameter, together with conditional strength. When these multitubular water-pockets are applied to an entirely new horizontal boiler flue or flues or other portion of such boiler, it might be found advisable to weld them in position. In other cases (such as, for instance, when fitting certain shapes of pocket to the cylindrical flue of an existing boiler) then a calking-strip' might be necessary between the flue-ring d and the outer periphery of the riveting-flange of the pocket a. Inevery' instance the flue-ring d or other plate-surface covered by these water-pockets is retained and ample and suitable openings 6 only are pierced therein to admit the ingress of water and rovide for evaporation, ebullition, internal c caning, and examination of pockets and tubes. Between each of the said waterpockets when fitted to a horizontal flue, furnace-tube, or other part sufficient combustion spaces or chambers are provided longitudinally, which furnishes working space to enable repairs to be executed as well as withdrawal, renewal, and cleaning of tubes 1), ex amination of pockets (1 and flue-rings (1. Also beneath each pocket and the flue-rings or furnace-flue to which they are attached clear and sufficient space 9 is provided to admit of a man passing along the entire length of such I flue or furnace. WVhen these pockets are applied internally to the furnace-tube of a vertical boiler, the facilities previously mentioned for examination, repair, and the like are similarly maintained, but of necessity in this instance the said fire-tubes in the direction of their length lie in the vertical instead of the horizontal plane, as will be readily understood without special illustration.

In order to apply this invention, no structural alterations or special modifications of design are required to be made to an existing steam-boiler. Neither is the strength or stability of the flue or furnace ring (1 diminished by its introduction.

Increased effective heating-surface is attained through the medium of the horizontal or inclined fire-tubes b in the water-pockets a in conjunction with the front plate It and other exposed surfaces of each successive water-pocket, through which the said plate and surfaces the flame-heat is driven by its own impact. By these means and by the absorbed heat attained through the fire-tubes b, the water-pockets a, and the combustion-chambersf the water circulation and the evaporative and rapid steam-generative powers are swiftly increased.

The arched form of pocket illustrated in Figs. 1, 2, and 3 has a central flue-space g, providing an unbroken course to facilitate inspection and cleaning.

Figs. 4 and 5 show also pockets providing a central inspection and cleaning space g, which pockets, however, are displaced to cause a reversion of the course of the furnacegases.

The bottom of the tubular water-pockets shown in Figs. 1, 2, 3, 6, and 7 and Figs. 4, 5, 10, and 11 inclining toward the side of the flue'tube causes any sediment which otherwise would have a tendency to accumulate thereon to run off, and thereby leave and render the pocket self-cleaning, which is very important, as the steam-generative power of the pocket is thereby preserved.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a boiler for the generation of steam and for other purposes, a flue-tube and a tubular water-pocket therein having a bottom inclining toward the side of the flue, all substantially as and for the purpose set forth.

2. In a boiler for the generation of steam and for other purposes, a flue-tube and a tubular water-pocket therein having an archedlike bottom inclining toward each side of the flue-tube, all substantially as and for the pur pose set forth.

3. In a boiler for the generation of steam and for other purposes, a flue-tube and a series of tubular water-pockets therein, the bottoms of which incline alternately toward each side of the flue-tube, all substantially as and for the purpose specified.

4. In a boiler for the generation of steam and for other purposes, a furnace-flue, a se ries of water-pockets in the interior thereof, fire-tubes passing through each of the said water-pockets and openings in the said furnace -flue communicating with the waterspace in the boiler and the interior of the said pockets, the said fire-tubes varying in diameter in each of the said pockets, all substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN EDWARD GRACE.

Witnesses:

ALFRED BOSSHARDT, STANLEY S. BRAMALL. 

